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Brand new Bm869s calibration
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mrdave45:
Hi,
I've decided that I need to upgrade the twenty year old maplin dmm I bought as a student. It's starting to get a bit flakey and I'm also fairly sure it's quite inaccurate. This has generally not been too much of a problem. Mostly relative measurement have been good enough. I'm now needing to be able to measure various parameters to a decent accuracy as well as better precision.
I'll probably get my self a decent lcr meter too.

Im pretty much set on a Bm869s. This seems to be a good all round meter and should be leagues better than my current one.

I've been searching round the forum about the 869s and it seems there's quite a few comments about these being far off calibration out the box.

I've also read a few posts about people doing a quick calibration. I would have thought a fairly sophisticated pice of kit is needed to calibrate a meter properly beyond checking against a 5v source or whatever.

Do I need to get a calibrated one, to what level, or should I get one stock and put that money towards an ltz1000 reference.

Im mainly needing voltage and frequency to be super duper out of this thing. I expect to get really good capacitance (tightly matching pf caps) or resistance measurements I want an lcr meter. Probably a de 5000.

I think a high end bench meter is a bit beyond budget and probably overkill for what I need so just a good solid dmm should be just the ticket.
Fungus:

--- Quote from: mrdave45 on February 19, 2021, 03:04:04 am ---I've been searching round the forum about the 869s and it seems there's quite a few comments about these being far off calibration out the box.

--- End quote ---

It has a warranty...

Buy it from a decent supplier, send it back for a replacement if it's out of spec on arrival.
mrdave45:
Maybe that's answered my question. I'm not going to know of it put of spec unless it's calibrated.
:(
Fungus:

--- Quote from: mrdave45 on February 19, 2021, 12:16:49 pm ---Maybe that's answered my question. I'm not going to know of it put of spec unless it's calibrated.
:(

--- End quote ---

I guess if you have nothing to compare it with then you can't know. Do you know anybody else with a decent mater?

Welectron will sell you one with ISO calibration certificate for 70 Euros more.

https://www.welectron.com/Brymen-BM869s-Multimeter_1

That won't tell you if it's gone out of spec after 6 months though, or after an "incident". For that you need to learn about building voltage references and stuff.

Another option is to get yourself a second meter to compare it against. eg. The Aneng 870 has good accuracy specs for the basic measurements and would be a good sanity check that costs half as much as that calibration certificate. Get gold leads too, they're worth it.

(Plus you get a second meter, which you need  :) )
mrdave45:
I still have my maplin wg020 as a second meter.
I guess I need the calibration and if I build a reference at least I can tell if the things drifting over time. Although that will presumably only tell me about voltage (maybe current) but won't say anything about frequency.
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